Tooth for threshing-machines.



F. B. GARLSON.

TOOTH FOR THRESHING MACHINES. APPLICATION rum) NOV.11, 1907.

kgga 44 l y a HIIIIW 62X): A mofz b PATENTED APR. 2 l, 190 8.

FRED B. OARLSON, OF HOLDREGE, NEBRASKA.

T 00TH FOR THRE SHIN G-MA CHINE S Specification of Letters Patent.

Patented April 21, 1908.

Application filed November 11, 1907. Serial No. 401,647.

To all whom it may concern:

Be it known that I, FRED B. CARLSON, citizen of the United States,residing at Holdrede, in the county of Phelps and State of Nebraska,have invented certain new and useful Improvements in Teeth forThreshingiNIachines, ofwhich the following is a specification.

My invention relates to teeth for the cylinders and concaves ofthreshing machines.

AlIlOllg the objects in view is to provide a threshing tooth which willbe durable and which will not, in the act of threshing, take the grainthrough in bunches, but which at the same time will efficiently andthoroughly thresh the kernels from the stalks and with the above objectsin view, the invention consists in the novel construction of the toothas hereinafter fully described, illustrated in the drawing and pointedout in the appended claim.

In the drawing :-Figure 1 is a side view of my improved threshing tooth.Fig. 2 is a view showing the working edge of the tooth provided with thesharpened tapering projeeting portion or rib. Fig. 3 is a sectional Viewon the line 33 of Fig. 1. Fig. 4 is a lower edge view. I

In threshing with teeth presenting a broad workin face or edge to thegrain, the teeth are liable to carry the grain along in bunches so thatthe threshing of the kernels is only imperfectly performed, and whilethreshing teeth have been used which present a tapering or wedge-shapeedge to the grain, yet such form of teeth have the disadvantage of notpresenting sufficient working surface to the grain to thoroughly threshthe latter and the primary object of my invention is to so construct thetooth that while it will not carry the grain along in bunches, it willat the same time present sufficient surface to effect ively thresh thegrain and in the drawings 1 indicates my improved tooth, the shankportion 2 of which may be suitably constructed with a view of beingattached in any suitable manner to the cylinder or concave of athreshing machine.

The body portion 3 of the tooth tapers from the point where it joins theshank to the edge 4 and the said body portion is provided at its workingedge 5 with an integral rib or projecting portion 6 which extends from apoint approximately on a line with the beginning of a shank to the edge4, the lower edge 7 of the said rib being coincident with and forming acontinuation of the edge 4. The rib is made tapering or wedgeshape, itbeing thicker at the point where it joins the body portion of the toothand tapering outwardly to its working edge 8, which edge is sharpened asseen. The width of the rib where it joins the body portion issomewhatless than the width of the edge 5 so that shoulders 9 are formedon opposite sides of the rib. The rib also tapers from the end adjacentto the shank of the tooth to its opposite end as seen in Fig. 2, andsaid rib is of less width at its p uter end than at its inner end asseen best in By making the rib tapering from its inner to its outer end,said outer end which is the first to engage with the grain, will morereadily penetrate between the stalks and by reason of the tapering shapesaid stalks will be gradually forced apart by reason of the taperingshape of the rib and, furthermore, by reason of the shoulders on eachside of the rib, the kernels will be threshed from the stalks owing tothe action of the said shoulders during the threshing operation, whichshoulders present sufficient working surface to accomplish the thoroughthreshing of the grain.

By reason of the sharpened edge of the rib, the tooth is assisted inentering the grain and prevents the tooth from carrying the latter alongin bunches, and this idea of providing the rib with a sharp working edgepossesses an advantage over any construction which would not possess asharpened edge. It will also be noted that by reason of the shoulders oneach side of the rib being of the same width from the inner ends of saidshoulder to the outer ends thereof, the shoulders provide an efficientworking action along their entire length in the threshing operation.

\Vhat I claim is A threshing tooth comprising a shank and a bodyportion, said body portion tapering from its inner end where it joinsthe shank to the outer end and being provided along its site sides, andsaid ribs also being of less outer edge with a rib which tapers from thewidth at its outer end than at its inner end. 10 point where it joinsthe body portion to its In testimony whereof I aflix my signature outeredge, which latter edge is sharpened in presence of two witnesses.

5 along its entire length, and said rib also FRED B. OARLSON.

tapering from its inner to its outer end and Witnesses:

being of less width than the body of the G. NORBERLY,

tooth whereby to form shoulders on oppo- A I W. M. RANK.

